Vtec Tranny Rebuild Question

So, in the next month or so I'm going to finally get around to tearing my VFR apart and replacing 2nd & 6th gear ( 6th is the intersecting gear that engages 2nd gear ). for about the past 6k miles I can't shift from 1st to 2nd while in Vtec without the bike dropping into neutral. Its my fault from missing gears and wearing the intersecting gears down, and possibly bent shift forks from missing gears, I won't know that until I get in there. Totally my doing though, my bikes had a ruff life for the past 30k miles :P

My question to anyone thats had the tranny out of the VFR. Can you flip the motor upside down and lift the lower case off the upper case, instead of taking the entire top end off? Looking over the schematic, it should work, there's no bolts going through from the top end thats holding the crankcases together, everythings externally bolted. I can't just lift the motor up and drop the bottom half off because of the way the crankshaft is setting. Disassembly should be easy enough that way, although getting the shift forks to hold position while reassembling might take an extra set of hands to half the tranny shafts in the bottom half while holding it upside down when placing the cases back together. Its seems like a really really simple crankcase setup, just curious if anyones attempted to take it apart from the bottom side. It should work. Others experience?

Only things I can think of are that residual fluids will leak past the rings? Or, not being able to get parts out because internally, they're bolted in from the top side?   :blink:

There's nothing internally bolted in, that much I'm sure of. But yes I'm sure oil will leak past the rings which would just result in a lot of smoke when I start it back up after completion. I'll probably take time to do a writeup on it as I go along.

[image: View Post]tinyminds, on Dec 3 2007, 03:51 PM, said:

There's nothing internally bolted in, that much I'm sure of. But yes I'm sure oil will leak past the rings which would just result in a lot of smoke when I start it back up after completion. I'll probably take time to do a writeup on it as I go along.
Hmm. Scratching my head here... doesn't seem like there'll be a problem... just seems so unnatural for a bike motor to be upside down, heh. Never seen it done. You can be first to show me, I guess!!  http://www.vfrdiscus...tyle_emoticons/default/smile.gif

We used to be able to do it this way in the old days on some (not all) of the old Honda twins..... :thumbsup:   I was looking at the VFR shop manual a while ago.....it does look feasable, but I've never been into a VFR........... :warranty:

This is stardard procedure for the Kawasaki H1-H2 motors....it does look odd however.  I will be interested in seeing if it works for the VFR.  I would worry about residual oil...if you drain the oil well there isn't much residual in there....and the rings block it just find the other way.

[image: View Post]skuuter trash, on Dec 3 2007, 05:28 PM, said:

We used to be able to do it this way in the old days on some (not all) of the old Honda twins..... :thumbsup:   I was looking at the VFR shop manual a while ago.....it does look feasable, but I've never been into a VFR........... :warranty:
I agree with Skuuter here.  I know it's a completely different animal, but that is how I did 2nd gear on a Concours.  I-4 versus V-4 but still the same basic tranny layout.  FWIW, the Connie didn't smoke much at all after I fired it up either.  Maybe you can just flip the bike upside down instead of pulling the motor, kinda like I did to my old bicycle. :goofy:

[image: Posted Image]

If you drain the engine first, as long as it takes to fix the tranny, button it back up and get it back in the bike, there won't be enough oil above the pistons to worry about.......might "puff" when it first starts, but that's about it............ :thumbsup:

OH, bold adventurer, brave explorer to venture where few would dare to go!!